No, practically speaking, you cannot have both a full-time contract (Vollzeit) and a Minijob contract with the same employer at the same time. The reasons are:

1. Aggregation of income with the same employer

Legally, all income you receive from the same employer is added together to determine whether your employment is considered “geringfügig” (Minijob) or not.
If you already have a Vollzeit position (with a salary exceeding the Minijob threshold), then any extra work, overtime, or additional hours are simply added to your full-time salary.
You cannot split off a portion of this income and treat it as a separate Minijob.

2. Monthly income limit for a Minijob

For a contract to qualify as a Minijob, your income from that contract must not exceed €556 per month (as of 2025).
Since a typical full-time salary is well above this limit, any additional work you perform for the same employer cannot be classified as a Minijob. Instead:

• it is added to your regular salary, and

• it is subject to full social security contributions and normal taxation.

3. Registration with the Minijob-Zentrale

In the case of a genuine Minijob, the employer must register this employment separately with the Minijob-Zentrale.
However, it is not possible for the same employer to register your income twice under:

• one full-time contract, and

• one Minijob contract,

because the system recognises the same employer, as well as your personal and bank details, as belonging to a single employment relationship.

Possible alternatives

• Minijob with a different employer:
  You can combine a Vollzeit job with Company A and a Minijob with Company B, as long as the Minijob is fully independent and with a different employer.

• Second part-time contract (Teilzeit) with the same company:
  Instead of a Minijob, you may conclude an additional Teilzeit contract with the same company, provided your contract and internal rules allow it, and your total weekly working time does not exceed the legal limit (generally 48 hours per week).

In short:
You cannot legally classify any part of your extra work with the same company as a Minijob if you already have a Vollzeit contract there.
Your income is treated as a whole, and you are subject to full social security contributions and normal taxation.

The authors and editors of this website strive to provide accurate information based on in-depth research and multiple sources. Nevertheless, errors may occur or some information may not be fully confirmed. Therefore, please consider the information in this article as an initial reference and always consult the competent authorities or professional advisers for binding and up-to-date guidance.